/*
 * Copyright 2012-2025 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.assertj.core.internal.iterables;

import java.util.Iterator;
import java.util.List;

class SinglyIterableFactory {

  static Iterable<String> createSinglyIterable(final List<String> values) {
    // can't use Iterable<> for anonymous class in java 8
    return new Iterable<String>() {
      private boolean isIteratorCreated = false;

      @Override
      public Iterator<String> iterator() {
        if (isIteratorCreated) throw new IllegalArgumentException("Cannot create two iterators on a singly-iterable sequence");
        isIteratorCreated = true;
        return new Iterator<String>() {
          private final Iterator<String> listIterator = values.iterator();

          @Override
          public boolean hasNext() {
            return listIterator.hasNext();
          }

          @Override
          public String next() {
            return listIterator.next();
          }
        };
      }
    };
  }

}
